Heat transfer in granular medium for application to selective laser melting: A numerical study
Heat transfer in granular medium for application to selective laser melting: A numerical study
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DOI：
10.1016/j.ijthermalsci.2016.11.014
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发表时间：
2017-03
影响因子：
4.5
通讯作者：
R. Dayal;T. Gambaryan-Roisman
中科院分区：
文献类型：
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作者：
R. Dayal;T. Gambaryan-Roisman
在这项研究中，由于移动的激光源在颗粒介质中的传热进行了数值研究。提出了一个激光能量在颗粒介质中吸收和传输的数值模型。该过程与金属粉末的激光熔化/烧结特别相关。非连续介质方法被用来考虑颗粒介质的离散性。每个单独的模块的热模型的验证。模拟结果表明，数值方法预测粉末床的性能和激光熔化/烧结工艺变量（晶粒尺寸，材料发射率，基板性能等）的影响的能力。对激光能量在粉末床中的分布和传输的影响。
In this study, the heat transfer in a granular medium due to a moving laser source is investigated numerically. A numerical model on laser energy absorption and its transport in granular media is presented. This process is especially relevant to laser melting/sintering of metal powders. The non-continuum approach is used to consider the discrete nature of granular medium explicitly. The validation of each of the individual modules of the thermal model is presented. The simulation results demonstrate the ability of numerical approach to predict powder bed properties and influence of laser melting/sintering process variables (grain size, material emissivity, substrate property etc.) on laser energy distribution and transport in the powder bed.